Sanjay Patel e8535fa784 [InstCombine] allow Negator to fold multi-use select with constant arms ...

The motivating test is reduced from:
https://llvm.org/PR52261

Note that the more general problem of folding any binop into a multi-use
select of constants is still there. We need to ease the restriction in
InstCombinerImpl::FoldOpIntoSelect() to catch those. But these examples
never reach that code because Negator exclusively handles negation
patterns within visitSub().

Differential Revision: https://reviews.llvm.org/D112657

2021-10-28 08:35:58 -04:00

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